natural conditions in the dark. Lizards were in crevices 10– 28 cm deep (n = 17; mean – 1SE = 18.0 – 6.1 cm) and were detected by the radioreceiver as far away as 60–70 m, but more commonly at 30–40 m. Radiotransmitters were defecated and recovered partially embedded in feces on tops of rocks, the usual site of defecation for C. collaris. Retention time (radiotransmitters in digestive tract) was 3–4 days. There was no significant change in mass of lizards during sessions (two lizards were used in both sessions; Wilcoxon signed-rank test: Z = 0.282; n = 8, P = 0.778), but our sample was small. Based on the lack of a decrease in mass while radio- transmitters were in place, the fact that ejected radio- transmitters were embedded partially in feces, and obser- vations of lizards basking and behaving normally during the day, we conclude that the force-fed-radiotransmitter technique did not affect digestion. In addition, feeding behavior probably was not affected. Goodyear and Lazell (1994) reported that I. pinguis retained fed radiotransmit- ters 7 days before being passed in feces, and they believed that lizards continued to feed normally during that time. Nevertheless, a longer study is needed to conclude that intake of food is not affected while the radiotransmitter is retained internally. We recommend this force-fed tech- nique for short-term studies in medium-to-large lizards that refuge in tight spaces and, consequently, may rub off externally placed radiotransmitters. This technique is less invasive than implantations via surgery and is simple, quick, effective, and easily implemented in the field, but it is of relatively short duration unless the subject is recaptured and made to re-ingest the radiotransmitter. We thank Oklahoma Gas and Electric Sooner Lake Power Station for permission to work on their property, Consejo Nacional de Ciencia y Tecnolog´ ıa (Beca-Mixta 211488) for financial support of travel and research expenses to ESB, and J. A. Lemos-Espinal, D. ´ Avila-N´ ajera, and C. Vargas for advice. This research was conducted with approval of the Oklahoma State University Institutional Animal Care and Use Committee (permit AS-09-3). LITERATURE CITED BOARMAN, W. I., T. GOODLETT , G. GOODLETT , AND P. HAMILTON. 1998. Review of radio transmitter attachment techniques for turtle research and recommendations for improvement. Herpeto- logical Review 29:26–33. COCHRAN, W. W. 1980. Wildlife telemetry. Pages 507–520 in Wildlife management techniques manual (S. D. Schemnitz, editor). Fourth edition. Wildlife Society, Washington, D.C. ENDRISS, D. A., E. C. HELLGREN, S. F. FOX, AND R. W. MOODY . 2007. Demography of an urban population of the Texas horned lizard (Phrynosoma cornutum) in central Oklahoma. Herpeto- logica 63:320–331. FERNER, J. W. 2007. A review of marking and individual recognition techniques for amphibians and reptiles. Society for the Study of Amphibians and Reptiles Herpetological Circular 35:1–72. FISHER, M., AND A. MUTH. 1995. A backpack method for mounting radio-transmitters to small lizards. Herpetological Review 26:139–140. GOODMAN, R. M., C. R. KNAPP , K. A. BRADLEY , G. P. GERBER, AND A. C. ALBERTS. 2009. Review of radio transmitter attachment methods for West Indian rock iguanas (genus Cyclura). Applied Herpetology 6:151–170. GOODYEAR, N. C., AND J. LAZELL. 1994. Status of a relocated population of endangered Iguana pinguis on Guana Island, British Virgin Islands. Restoration Ecology 2:43–50. MADRID, S. C. A., AND C. J. B. VALDIVIA. 2004. T´ ecnicas de colocaci ´ on de radiotransmisores en serpientes. Bolet´ ın de la Sociedad Herpetol ´ ogica Mexicana 16:5–12. RIVAS, J. A. 2001. Feasibility and efficiency of transmitter force- feeding in studying the reproductive biology of large snakes. Herpetological Natural History 8:93–95. RODR ´ IGUEZ-ROBLES. J. A. 2003. Home ranges of gopher snakes (Pituophis catenifer , Colubridae) in central California. Copeia 2:391–396. WHITE G. C., AND R. A. GARROT . 1990. Analysis of wildlife radio- tracking data. Academic Press, San Diego, California. Submitted 12 January 2011. Accepted 11 May 2012. Associate Editor was Rocky Ward. THE SOUTHWESTERN NATURALIST 57(4): 459–462 NEAR COLONIZATION OF A DESERT ISLAND BY A TROPICAL BIRD: MILITARY MACAW (ARA MILITARIS) AT ISLA SAN PEDRO NOLASCO, SONORA, MEXICO JUAN PABLO GALLO-REYNOSO,* RICHARD STEPHEN FELGER, AND BENJAMIN THEODORE WILDER Centro de Investigaci´ on en Alimentaci´ on y Desarrollo A.C., Unidad Guaymas Carretera a Varadero Nacional km 6.6, Colonia Las Playitas, Guaymas, Sonora C.P. 85480, M´ exico (JPG) University of Arizona Herbarium, P.O. Box 210036, Tucson, AZ 85721 (RSF) University of California, Riverside, Department of Botany and Plant Sciences, 2150 Batchelor Hall, Riverside CA 92521 (BTW) *Correspondent: jpgallo@ciad.mx December 2012 Notes 459